package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.common.BaseContext;
import com.itheima.common.CustomException;
import com.itheima.dto.OrderDto;
import com.itheima.entity.*;
import com.itheima.mapper.OrderMapper;
import com.itheima.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * 订单
 */
@Slf4j
@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private OrderService orderService;

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;


    /**
     * 用户下单
     *
     * @param orders
     */
    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id
        Long userId = BaseContext.getCurrentId();

        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(queryWrapper);
        //如果为空，则不能下单
        if (shoppingCarts == null || shoppingCarts.size() <= 0) {
            throw new CustomException("购物车为空，不能下单");
        }

        //查询用户数据
        User user = userService.getById(userId);
        //查询地址数据
        AddressBook addressBook = addressBookService.getById(orders.getAddressBookId());
        if (addressBook == null) {
            throw new CustomException("收货地址为空，不能下单");
        }

        //获取订单id
        long orderId = IdWorker.getId();
        //原子整型，保证在多线程下也能计算正确无误
        AtomicInteger amount = new AtomicInteger();

        //从购物车中遍历数据出来，然后存到orderDetail中去
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //累加金额
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        //补充订单表的字段
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //向订单表插入一条数据
        orderService.save(orders);

        //向订单明细表插入多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(queryWrapper);
    }

    /**
     * 前台用户查询历史订单
     *
     * @param page
     * @param pageSize
     * @return
     */
    @Override
    public Page<OrderDto> queryOrderPage(int page, int pageSize) {
        //获取用户id
        Long userId = BaseContext.getCurrentId();
        //分页构造器
        Page<Orders> pageInfo = new Page<>(page, pageSize);
        Page<OrderDto> orderDtoPage = new Page<>(page, pageSize);
        //条件构造器
        LambdaQueryWrapper<Orders> queryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.eq(userId != null, Orders::getUserId, userId);
        queryWrapper.orderByDesc(Orders::getOrderTime);
        //执行查询
        //这一句有什么用呢？
        orderService.page(pageInfo, queryWrapper);

        //对象拷贝，除了records属性
        BeanUtils.copyProperties(pageInfo, orderDtoPage, "records");
        List<Orders> records = pageInfo.getRecords();
        List<OrderDto> list = records.stream().map((item) -> {
            OrderDto orderDto = new OrderDto();
            //获取orderId,根据这个id去orderDetails中查数据
            Long orderId = item.getId();
            LambdaQueryWrapper<OrderDetail> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(OrderDetail::getOrderId, orderId);
            List<OrderDetail> details = orderDetailService.list(wrapper);
            //拷贝对象属性
            BeanUtils.copyProperties(item, orderDto);
            orderDto.setOrderDetails(details);
            return orderDto;
        }).collect(Collectors.toList());
        orderDtoPage.setRecords(list);
        log.info("list:{}", list);
        
        return orderDtoPage;
    }
}
